Dynamo-electric machine of the inclosed type.



. c. E. LORD. DYNAKQBLEOTBIO MACHINE 0F THE'INCLOSED TYPE.

APPLIO ATIOIIILBD ILL-30, 1907.

Patented Jan. 5, 1909.

2 SHEETS-SHEET 1.

0. E. LORD; DYNAMO ELEGTRIG LAGHINE OF THE INGLOSED TYPE.

APILIOATIOE FILED MAR. 30, 1907.

Patented Jan. 5,1909.

2 SHEETS-SHEET 2.

M XM

UNITED STATES PATENT OFFICE.

CHARLES E. LORD, OF NORWOOD, OHIO, ASSIGNOR TO ALLIS-CHALMERS COMPANY,A. CORPORATION OF NEW JERSEY.

DYNAMIC-ELECTRIC MACHINE on THE INCLOSED TYPE.

Specification of Letters Patent.

Patented Jan. 5, 1909,

AppIication filed March 30,1907. SeriaI- No. 365,443.

To all whom it may concern:

Be it known that I, OnA-RLEs'E. LORD, a citizen of the United States,residing at Norwood, in the county of Hamilton and State of Ohio, haveinvented certain new and useful Improvements in Dynamo-Electric Machinesof the Inclosed Type, of which the following is a full, clear, and exactspeci 'lication.

My invention relates to machines or apparatus through which acirculation of air is maintained and particularly to incloseddynanio-electric machines which are cooled by a forced circulation ofair.

it is common practice to inclose certain types of dynamo-electricmachines in housings or casings through which air is forced to dissipatethe heat generated in the machines. The circulation of air is usuallymaintained through the housing by fans or blowers on the shaft'orrotating element, the air being led into the housing through I admissionchambers which are located at housing the ends of thehousing and extendu ward from the bottom thereof to the sha't.

The shaft passes through the walls of-the housing fit closely around theshaft there is a liability that warm an, or air laden with moisture oroil, will be drawn into the through the annular clearance spaces betweenthe shaft and the walls of the housing.

The object of my invention is to prevent a leakage of air into thehousing through the annular clearance openings or spaces tween the shaftand the Walls of the housmg. I accomplish this obiect by providing onthe shaft within or adiacent the shaft openings in the walls of thehousing, fans or blowers which force air outward through said annularclearance spaces so as to counteract or overcome any tendency for aleakage inward. v

For a better understanding of my invention, reference is had to theaccompanying drawings in which- Figure 1 is a partial sectionalelevation of an inclosed dynamo electric machine equip 'ied with myinvention; Fig. 2 is a se 'tion along the line 2-2 of Fig. 1 looking inhe direction indicated by the arrows; and Fig. 3 is a sectionalelevation of an inclosed bev dynamo-electric machine equi ped with myinvention, the constlnction o the housing being slightly different fromthat shown in 4 ]chine and housing, but it will be understood that theconstruction at both ends is the same. The main or middle portion of thehousing supports the core 13 of the sta. tionary armature of thedynamo-electric machine, inthis case a turbo alternator. The rotaryfield magnet 14 is mounted on a shaft 15 which extends through shaft 0enings 16 in the walls of the end portions 0 the housing, and issupported in bearings 17?.

The housing is provided at each end with an air admission chamber 18 andan air receiving chamber 19 which communicate with a receiving chamber20 at the bottom of the housing. The core is providedwithcircumferential ventilating passageways 21 which tom of the housingupward on each side and over the shaft, and an inner wall 24 between theside portions of the fiange. A ring 25 mounted on the face of the flange23 and inner wall 24 forms with the shaft an annular air passageway.Mounted on each end of the rotating element 14 adjacent said annularpassageway are fans or blowcrs' 26 which cause the air to pass throughthe housing and dynamo-electric machine.

" It is seen that in the construction of housing here shown the shaftextends directly through the walls of the admission chamber from whichthe air is exhausted by the fans 26. To prevent a leakage of air throughthe annular spaces or openings between the shaft and walls of thehousing I provide on the shaft directly within the shaft openings oradjacent thereto small fans or blowers 27 which are .so nstructed as tocreate a circulation of air trom the admission chambers outward through.said annular openings. The construction of these fans is immaterial, so"long as they, produce the proper flow of air either radial as shown oraxially of the shaft. It is seen that the walls of the housing fitcloselyaround the fans or blowers 27.

In Fig. 3 I have shown a slightly different form of housing. The housing10 consists as in the first instance of a main or centralortion" 11 andend portions 12. The ousing here shown diliers from the housmg shown in.Figs. Land 2 in the construction and arrangement of the admissionchambers. Theadmission chambers 18 as in the first instance are locatedat the ends of the holis-v ing and extend from the bottom of the housingupward around the shaft. The upper ends of the admission chambers inthis case extend outward from the end walls of the housing and are inthe form of annular passageways which completely encircle the shaft andare. formed or inclosed by walls which are independent of the shaft andend the inner sides of the end walls of the housing will be slightlygreater than on the outer sides of said walls and that there will belittle or no tendency for the air to leak into the housing through theshaft openings. To decrease still "further the liability of leakage ofair inward through the annular spaces between the shaft and walls of-the housing, I mount on the shaft within said shaft 0' enings fans orblowers 27 which tend to orce the air-outward from the receivingchambers.

1t is seen that in both constructions air can 3 enterrthe housing onlythrough the admission openingsin the lower portions of the admissionchambers and all the air that passes through the housing and machinecomes froma source of supply free from oil, mois-' ture, dust and otherforeign matter.

I do not desire to be confined to the exact details shown but aim inmy'claims to cover all modifications which do not involve a de parturefrom the spirit and scope of my invention.

. What I claim as new and desire to secure by Letters Patent is 1. 1ncombination, a housing or casing, a shaft extending through openings inthe walls of the housing, means for mairJ ainirfihn air pressure in saidhousing, ands paratemeans tor forcing air outward through the shaftopenings.

2. in combination, a housing or casing, .a shaft extending through theWall of the housing, means for maintaining a fluid pressure in thehousing, and separate means comprising fans or blowers for preventing aleakage of air inward Ithrough the clearance space between the shaft andsurrounding wall of the housing.

. 3. In combination, a housing or casing, a shaft extending throughopenings in the wallsof the housing, means for maintainingh circulationof air through said housing, and fans or blowers mounted on the shaftwithin the shaft openings in the walls of the housing for forcing airoutward throughthe annular clearance spaces bet-ween the shaft andsurrounding walls of the housing.

4. In combination, a shaft, a housing or casing through whichsaid shaft"exthds, said housing or casing comprising an admission chamber having anannular opening or passageway around the shaft, means for causing acirculation of air through said ad- .mission chamber, and fansor'blowers mounted on the shaft adiacent the walls of the housing forpreventing a leakage of air in ward around the shaft.

5. In combination, a shaft, a housing or casing through which said.shal't extends, said housing or casing" comprising a receiving chamberand admission chambers having annular openings or passageways around theshaft, means operated by said shaft for 'caus ing the circulation of airfrom the admission chambersto the receiving chambers, and separate fansor blowers mounted on the shaft for causing a circulation of airoutward.

through the clearance spaces about the shaft. In testimony whereol Iaflix my signature, in the presence of two vs itnesses.

- CHARLES E. LORD. Witnesses:

A. F. KWIS, FRED J. KINsEY.

